Question

The length around the boundary of a complete circle is called __ of the circle.

• A. circumference
• B. Perimeter
• C. Area
• D. Closed surface area

Answer 1

Answer: (A), (B)

The correct options are
A circumference
B Perimeter

The boundary of the circle is called its circumference and the value of circumference is $2\pi r\left(\text{where r is the radius of the circle}\right)$. If we cut a circle and form a line from it, then the length of the line will be the same as the circumference of the circle.